Qualitative identification of group composition in crude oil from different oil fields using terahertz time-domain spectroscopy

Optical properties of the group components in crude oil were studied using terahertz time-domain spectroscopy (THz-TDS) under nitrogen environment at ambient temperature. The group composition of crude oil from different oil fields were analyzed on the basis of terahertz spectra. Both time delay and amplitude of terahertz wave were modulated in accordance with group composition. The features of terahertz spectra which contain information from different parts of the crude oil group composition can be qualitatively analyzed to detect the group components of the crude oil.